Race Simulation and Energy Management System for a Solar Car

This study develops a race-simulation and energy-management framework for AribaX in the 24-hour iLumen European Solar Challenge. The method combines a tractive-force model, a surface-mounted PMSM torque formulation, an efficiency-map based power path, and a pack-level balance for current and state of charge. It uses routine telemetry from the motor controller, the MPPT units, and the BMS. With measured speed as input, the model predicts 57.278 Wh per lap versus 58.154 Wh measured. Across 11 laps, the mean signed difference is 1.19%, the mean absolute percentage error is 2.81%, and the RMSE is 1.95 Wh. This accuracy supports practical choices such as pace targets, quantifying regeneration and auxiliary loads, and planning charge stops. The framework is simple to deploy, easy to interpret, and adaptable, which supports strategist workflows where real time data adjustments are essential during endurance racing.